PWM rectifier

About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.

Modeling and Simulation of Three-phase Rectifier Based on SVPWM

Abstract: The mathematical and simulation model of three-phase voltage source rectifier (VSR) used in aircraft is introduced in this paper. Based on the model, the principle of the seven-segment space vector pulse-with modulation (SVPWM) control strategy is presented. The double closed-loop control method is applied in the PWM rectifier. The rectifier can realize unity power factor by adopting the fixed switching frequency SVPWM current control method to realize that the current signal track voltage. The simulation results show that the mathematical model is accurate, and the SVPWM current control method can administer to improve the dynamic performance of three-phase rectifier obviously.

Direct power active disturbance rejection control method for three-phase voltage source PWM rectifier

Abstract: The invention discloses a direct power active disturbance rejection control method for a three-phase voltage source PWM rectifier The method includes the following steps that the input instantaneous active power and the input instantaneous reactive power of the three-phase voltage source PWM rectifier are obtained; the instantaneous active power and the instantaneous reactive power serve as input of an expanded state observer, and based on the real-time observation value, the active power instruction value and the reactive power instruction value of system disturbance quantity, active power control quantity and reactive power control quantity can be respectively obtained according to the active power control rate and the reactive power control rate; according to the active power control quantity, the reactive power control quantity and a network voltage sampling value, the alpha-beta axis component instruction value of the input voltage on the alternating-current side of the rectifier is calculated; according to the alpha-beta axis component instruction value of the input voltage on the alternating-current side of the rectifier, a rectifier switching signal is obtained through a PWM module Through the method, direct power control over the rectifier is achieved in a static coordinate system, no phase-locked rings are needed, and phase information of network voltage does not need to be detected in real time

Three-phase multi-level PWM rectifier multi-carrier discontinuous voltage modulation strategy

Abstract: Multi-level PWM rectifier requires fewer semiconductor switches compared with its bidirectional multi-level converter counterpart Though three-level (multi-level) PWM rectifiers are known for more than 10 years, no multi-level PWM rectifier carrier based voltage modulation strategies were reported so far After multi-level PWM rectifier topologies introduction and classification, the paper presents a three-phase multi-level PWM rectifier phase shifted multi-carrier voltage modulation strategy based on appropriate discontinuous voltage commands transformation Suggested formalism naturally allows derivation of a multi-level PWM rectifier voltage amplitude (modulation index) vs voltage-current phase angle operation envelope without making use of space vector calculus PWM rectifier operation envelope becomes less restrictive with levels count increase and full utilization Suggested approach is not limited to a three-phase case and is applicable to a general multi-phase case

Virtual line-flux-linkage oriented vector control of three-phase voltage source pwm rectifier without line voltage sensors

Abstract: There is a great similarity between the circuit of three-phase voltage-source PWM rectifier and the stator of an inverter-fed AC motor.Therefore a virtual line-flux-linkage vector can be constructed similarly to the observation of AC motor flux linkage,which may serve as the oriented vector in the vector control of the PWM rectifier instead of the line voltage vector.As a result,the line voltage sensors will be eliminated and the costs of PWM rectifier can be reduced.The key problem of the virtual line-flux-linkage vector oriented control of the PWM rectifier without line voltage sensors is to observe the virtual line-flux-linkage accurately.However,there are initial problems in the observation of the virtual line-flux-linkage,similarly to the synchronous motors,should be solved.The observer without initial value estimation will lead to a large current rush,which sometimes could even cause the rectifier hard to start up.To solve the problem,the characteristics of the virtual line-flux-linkage were analyzed in this paper and a novel virtual line-flux-linkage observer with estimation of the initial value was suggested.The validity of the observer has been proved and the good dynamic and static performance of the PWM rectifier under the virtual line flux linkage vector oriented control without line voltage sensors have been showed by both simulation and experiment.

Fuzzy logic based direct power control for PWM three-phase rectifier

Abstract: This paper discusses a proposed control strategy based on fuzzy logic for three-phase PWM rectifiers. This technique is called direct control of fuzzy power (DPCF). The objective of this paper is to replace both hysteresis controllers that role for setting the active and reactive power by a single fuzzy controller which adjusts both active and reactive power at the same time. The aim of this work is to eliminate the harmonic currents and therefore reduce the total harmonic distortion of the line current and improve the power factor. This DPCF is tested by simulation studies on a three-phase PWM rectifier.